S = input()

if "RRR" in S:
    print("3")
elif "RR" in S:
    print("2")
elif "R" in S:
    print("1")
else:print("0") S = input() S input() input if "RRR" in S:
    print("3")
elif "RR" in S:
    print("2")
elif "R" in S:
    print("1")
else:print("0") "RRR" in S "RRR" S print("3") print "3" elif "RR" in S:
    print("2") "RR" in S "RR" S print("2") print "2" elif "R" in S:
    print("1") "R" in S "R" S print("1") print "1" S = input() input() S
S = input()

if "RRR" in S:
    print("3")
elif "RR" in S:
    print("2")
elif "R" in S:
    print("1")
else:print("0")